EP1654907B1 - Shallow loudspeaker - Google Patents
Shallow loudspeaker Download PDFInfo
- Publication number
- EP1654907B1 EP1654907B1 EP04744689A EP04744689A EP1654907B1 EP 1654907 B1 EP1654907 B1 EP 1654907B1 EP 04744689 A EP04744689 A EP 04744689A EP 04744689 A EP04744689 A EP 04744689A EP 1654907 B1 EP1654907 B1 EP 1654907B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- circumferential edge
- substantially flat
- outer circumferential
- folds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012528 membrane Substances 0.000 claims abstract description 78
- 230000007423 decrease Effects 0.000 claims description 5
- 239000003292 glue Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 3
- 241000239290 Araneae Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
- The invention relates to a loudspeaker which is provided with a frame, a membrane and a drive unit.
- Such speakers are generally known.
Figure 12 of the accompanying drawing shows a known loudspeaker. This speaker has a frame (1), a membrane (2) and an electromagnetic drive unit (4). The membrane is formed by a conical body (2a) and has a flat outer circumferential edge (2b) and a flat inner circumferential edge (2c). The drive unit is provided with a stationary part (4a) and a movable part (4b). The stationary part, which includes a permanent magnet and a magnetic yoke, is secured to the frame. The movable part includes a voice coil and a cylindrical coil support (4b1). At its outer circumferential edge, the membrane is connected to the frame by means of a flexible suspension (6) and at its inner circumferential edge, it is adhered to the coil support, which in its turn is connected to the frame by means of a spider (8). - The conventional conical body of the membrane of the depicted known loudspeaker has a certain height in order to obtain sufficient stiffness. The membrane should have a certain minimal stiffness in order to be able to move like a piston for low-frequency reproduction and to have a controlled behavior at and above the first break-up of the membrane for mid and high-frequency reproduction. For this reason, there arise problems relating to the speaker's performance if a shallow speaker, i.e. a speaker having a small height, is required in certain applications.
-
JP-A 54-6523 -
US4881617 discloses a speaker cone with a similar undulating inner edge glued to a central coil. -
DE1437372 shows a membrane for a loudspeaker with a pattern of folds extending radially between inner and outer circumferential edges. - Although the speaker known from
JP-A 54-6523 - It is an object of the invention to provide a loudspeaker which can be given a small weight Without deteriorating its sound performance and without hampering, its manufacture.
- This object is achieved with a loudspeaker having a membrane according to appended independent claim 1; the loudspeaker being defined in appended claim 7. The loudspeaker is provided with a frame, a membrane and a drive unit. The membrane includes a membrane body which, viewed in a circumferential direction, has a pattern of folds radially extending between an inner circumferential edge and an outer circumferential edge, wherein the folds have a depth, measured from the membrane body, which smoothly decreases from a portion of the membrane body between the inner and outer circumferential edges towards the outer circumferential edge, wherein the inner circumferential edge is a substantially flat inner circumferential edge and the outer circumferential edge is a substantially flat outer circumferential edge. It is to be noted that the expression "substantially flat" has the meaning of flat or practically flat in this document. A deviation, if any, of flatness of the edges must be small as compared with the maximal height and/or depth of the folds.
- In the loudspeaker, the substantially flat outer circumferential edge of the membrane body is suspended away from the frame, and the drive unit has firstly a stationary part secured to the frame and provided with a magnet system, and secondly a translatable part provided with a coil support secured to the substantially flat inner circumferential edge of the membrane body and comprising an electric coil.
- The loudspeaker according to the invention is provided with a membrane which is only undulated in an area extending between its subtantially flat circumferential edges. Because of this measure, the loudspeaker according to the invention is production-friendly because the circumferential edges are or are at least practically flat, whereby the connection of the membrane with the frame and the fixation of the membrane to the coil support can take place in conventional ways generally known for mounting membranes having flat circumferential edges. It is common practice e.g. to glue a flat inner circumferential edge of a membrane to the coil support. In this context, it is to be noted that The radial folds of the diaphragm applied in the speaker disclosed in
JP-A 54-6523 - Because of the specific corrugated structure applied in the membrane body of the loudspeaker according to the invention, the membrane is reinforced over its surface and has sufficient stiffness to be suitable as a shallow or flat membrane. The degree of undulations depends on the shape of the folds. In principle, the folds may have any shape, such as round or sharp, wherein the pattern may have tops and troughs. The pattern of folds may be uniform or non-uniform, viewed in a circumferential direction.
- A shallow loudspeaker provided with a membrane as described above has an excellent sound performance, due to its good behavior at and above the first break-up. In other words, also at and above the break-up there is little distortion of the reproduced sound.
- The folds preferably have a depth and/or height, measured from the membrane body, which smoothly decreases to the substantially flat outer circumferential edge and the substantially flat inner circumferential edge of the membrane.
- In a practical embodiment, the membrane body is a concave body, particularly a slightly concave body, the substantially flat inner circumferential edge and the substantially flat outer circumferential edge being in parallel planes. The membrane body is preferably cone-shaped. In general, the inner circumferential edge is circular; the outer circumferential edge may have a different shape, such as more or less elliptical.
- Another practical embodiment has the feature that the membrane body is, in principle, a flat body, the substantially flat inner circumferential edge and the substantially flat outer circumferential edge being in substantially coinciding planes.
- It is practical to adhere the membrane to the movable part of the drive unit, particularly to the coil support thereof. An existing glue may be used for this purpose.
- In certain applications, it may be preferred to apply a non-uniform pattern of folds. Acoustical properties of the loudspeaker and/or mechanical properties of the membrane can be adjusted by varying the degree of non-uniformity. Moreover, several shapes of folds are applicable.
- It is to be noted that the loudspeaker according to the invention is suitable for sound reproduction in hifi, home, automotive, TV and multimedia systems and, as already stated, it is particularly suitable for applications having very small build-in depths.
- The invention also relates to use of a membrane, as defined in
Claim 6. - With regard to the claims, it is noted that various combinations of embodiments and features as described in the claims are possible within the scope of the invention, defined in the independent claim.
- The invention will now be described in more detail, by way of example, with reference to the drawings, in which
-
Fig. 1 shows diagrammatically in a cross-section an embodiment of the loudspeaker according to the invention, -
Fig. 2 is a diagrammatical perspective view of the membrane of the embodiment shown inFig. 1 , -
Fig. 3 is a shape-fold distribution diagram of the membrane of the embodiment shown inFig. 1 , -
Figs. 4 to 10 show diagrammatically in cross-sections variants of the embodiment 1 shown inFig. 1 , -
Fig. 11 is a diagram displaying several suitable shapes of folds, and -
Fig. 12 shows diagrammatically a conventional loudspeaker. - The loudspeaker depicted in
Figures 1 to 3 is provided with aframe 101, amembrane 103 and anelectromagnetic drive unit 105. Themembrane 103 has a shallowconcave membrane body 104 provided with a flat outercircumferential edge 104a and a flat innercircumferential edge 104b and is provided with a pattern ofradial folds 104c, which pattern extends over the surface of themembrane 104, viewed in circumferential direction. Thefolds 104c, which are formed by tops, have a height (h) which increases from theouter edge 104a towards theinner edge 104b, the maximum height being located at some distance from the inner edge. Themembrane body 104 may be made of e.g. paper, particularly reinforced paper. Thedrive unit 105 comprises astationary part 106a and a movable, i.e. translatable,part 106b. Thestationary part 106a is secured to theframe 101 and has a magnet system including a permanent magnet 107 and amagnetic yoke 107b, and thetranslatable part 106b has a coil system including avoice coil 108a and a coil former orsupport 108b on which thecoil 108a is attached. The magnet system and the coil system can magnetically cooperate with each other through anair gap 109. Thecoil support 108b is adhered to the flat innercircumferential edge 104b by means of a suitable glue which may be a known glue. - The
coil support 108b is connected to theframe 101 by means of aspider 111 in a way known per se. - The outer
circumferential edge 104a is connected to theframe 101 by aresilient means 113, such as a roll-collar known per se and made of e.g. rubber or foam. - In this embodiment, the
folds 104c, which have aradial axis 105, smoothly attenuate on nearing the outercircumferential edge 104c. Thefolds 104c terminate in the vicinity of theinner edge 104b in such a way that themembrane body 104 can provide the desired flat inner edge. -
Figs. 4 to 10 show several further embodiments. As far as possible, the same reference signs are used for corresponding parts. - In the loudspeakers depicted in
Figure 4 , themembrane body 104 is provided with a ring-shapedrecess 300, viewed from thedrive unit 105, in order to enlarge the stroke of thetranslatable part 106b of thedrive unit 105. Therecess 300 is located at some distance from the flat innercircumferential edge 104b. A variant of therecess 300 is applied in themembrane body 104 of the loudspeaker depicted inFigure 5 . This recess, indicated by 400, borders on theinner edge 104b. In this example, thefolds 104c smoothly attenuate towards theinner edge 104b. Themembrane body 104 of the loudspeaker depicted inFigure 6 is provided withfolds 104c shaped by troughs. A variant of thismembrane body 104 is applied in the loudspeaker depicted inFigure 7 . In this variant, the structure offolds 104c is only provided in a restricted area between theedges - In contrast to the embodiments disclosed in
Figures 1 to 7 , wherein theedges Figure 8 has a flatouter edge 104a and a flatinner edge 104b which are positioned in the same plane. Themembrane body 104 is provided with a sinuating pattern offolds 104c, viewed in a circumferential direction. - In the variants shown in
Figures 9 and10 , the folds of the structure of folds have an undulating pattern in a radial direction. - The diagrammatical presentation in
Fig. 11 displays several possible shapes of folds and shapes of membranes. The membranes, which are indicated by 103. have a substantially flatouter edge 104a and a substantially flatinner edge 104b. The folds, which are denoted by thereference numeral 104c, may be regularly or irregularly distributed across the membrane face, dependent on the required properties of the membrane. The folds may have tops and/or troughs and thus have a height (h) and/or a depth (d) with regard to the membrane face. Several kinds of folds can be applied in combination, if desired. - It is to be noted that the disclosed embodiments are only given by way of example. Within the scope of the invention, it is possible to combine different features of several embodiments to build a loudspeaker according to the invention.
Claims (9)
- A membrane (103) intended for use in a loudspeaker, including a membrane body (104), which, viewed in a circumferential direction, has a pattern of folds (104c) radially extending between an inner circumferential edge (104b) and an outer circumferential edge (104a), wherein the folds have a depth, measured from the membrane body, which smoothly decreases from a portion of the membrane body between the inner and outer circumferential edges towards the outer circumferential edge,
characterized in that the inner circumferential edge is a substantially flat inner circumferential edge and the outer circumferential edge is a substantially flat outer circumferential edge. - A membrane (103) as claimed in claim 1, wherein the membrane body (104) is a concave body, the substantially flat inner circumferential edge (104b) and the substantially flat outer circumferential edge (104a) being in parallel planes.
- A membrane (103) as claimed in claim 1, wherein the membrane body (104) is, in principle, a flat body, the substantially flat inner circumferential edge (104b) and the substantially flat outer circumferential edge (104a) being in substantially coinciding planes.
- A membrane (103) as claimed in any one of claims 1 to 3, wherein the depth of the folds (104c) smoothly decreases from the portion of the membrane body between the inner and outer circumferential edges (104b, 104a) towards the substantially flat inner circumferential edge (104b) of the membrane body (104).
- A membrane (103) as claimed in any one of claims 1 to 4, wherein the pattern of folds (104c) is a non-uniform pattern, viewed in a circumferential and/or radial direction.
- Use of the membrane (103) as claimed in any one of claims 1 to 5 in a loudspeaker.
- A loudspeaker provided with a frame (101), a membrane (103) according to any one of claims 1 to 5, and a drive unit (105),
wherein the substantially flat outer circumferential edge (104a) of the membrane body (104) is suspended away from the frame, and
wherein the drive unit has a stationary part (106a) secured to the frame and provided with a magnet system (107, 107a), and a translatable part (106b) provided with a coil support (108b) secured to the substantially flat inner circumferential edge (104b) of the membrane body and comprising an electric coil (108a). - A loudspeaker as claimed in claim 7, wherein the substantially flat inner circumferential edge (104b) of the membrane body (104) is adhered to the coil support (108b) of the translatable part (106b) of the drive unit (105).
- A loudspeaker as claimed in claim 7 or claim 8, wherein the membrane edge has an inner portion (300, 400) adjoining the substantially flat inner circumferential edge (104b) of the membrane body (104), which portion recedes, viewed from the magnet system (107, 107a).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04744689A EP1654907B1 (en) | 2003-08-08 | 2004-07-30 | Shallow loudspeaker |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03102482 | 2003-08-08 | ||
PCT/IB2004/051336 WO2005015949A1 (en) | 2003-08-08 | 2004-07-30 | Shallow loudspeaker |
EP04744689A EP1654907B1 (en) | 2003-08-08 | 2004-07-30 | Shallow loudspeaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1654907A1 EP1654907A1 (en) | 2006-05-10 |
EP1654907B1 true EP1654907B1 (en) | 2011-12-07 |
Family
ID=34130296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04744689A Active EP1654907B1 (en) | 2003-08-08 | 2004-07-30 | Shallow loudspeaker |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080232633A1 (en) |
EP (1) | EP1654907B1 (en) |
JP (1) | JP2007502040A (en) |
KR (1) | KR20060058711A (en) |
CN (1) | CN1833465A (en) |
AT (1) | ATE536708T1 (en) |
WO (1) | WO2005015949A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602006016438D1 (en) | 2005-05-25 | 2010-10-07 | Nxp Bv | IMPROVED MEMBRANE FOR AN ELECTRIC ACOUSTIC TRANSFORMER |
JP4710462B2 (en) * | 2005-07-21 | 2011-06-29 | ソニー株式会社 | Speaker diaphragm and method for manufacturing speaker diaphragm |
JP4617518B2 (en) * | 2005-12-28 | 2011-01-26 | オンキヨー株式会社 | Speaker diaphragm and speaker using the same |
JP4750212B1 (en) * | 2009-07-24 | 2011-08-17 | ミネベア株式会社 | Speaker |
EP2630640A4 (en) * | 2010-10-21 | 2018-04-11 | Acoustic 3d Holdings Limited | Acoustic diffusion generator |
CN103931213B (en) | 2011-07-12 | 2017-08-15 | 斯特塔音响器材有限责任公司 | Balanced momentum inertia conduit |
CN103733644B (en) | 2011-07-12 | 2017-04-26 | 斯特塔音响器材有限责任公司 | Voice coil former stiffener and transducer |
US9628917B2 (en) * | 2014-07-23 | 2017-04-18 | Bose Corporation | Sound producing system |
WO2019111558A1 (en) * | 2017-12-07 | 2019-06-13 | ソニー株式会社 | Vibration system, speaker device, and video display device |
US11140488B2 (en) * | 2018-05-22 | 2021-10-05 | B&W Group Ltd. | Speaker-driver cone with increased stiffness |
JP7141906B2 (en) * | 2018-10-15 | 2022-09-26 | ホシデン株式会社 | Diaphragms and loudspeakers for loudspeakers |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1798688A (en) * | 1926-03-31 | 1931-03-31 | Victor Talking Machine Co | Diaphragm |
FR726180A (en) * | 1931-01-29 | 1932-05-24 | Gramophone Co Ltd | Improvements to acoustic diaphragms |
US2960177A (en) * | 1957-11-25 | 1960-11-15 | Hawley Products Co | Acoustical devices |
NL302559A (en) * | 1963-01-25 | |||
DE2215411A1 (en) * | 1971-03-31 | 1972-10-26 | Pioneer Electronic Corp , Tokio | Speaker cone |
JPS5424672Y2 (en) * | 1974-11-07 | 1979-08-20 | ||
JPS5190947U (en) * | 1975-01-20 | 1976-07-21 | ||
JPS546523A (en) * | 1977-06-17 | 1979-01-18 | Hitachi Ltd | Diaphragm of speakers |
JPS58138492U (en) * | 1982-03-10 | 1983-09-17 | パイオニア株式会社 | Support structure for electric/acoustic transducer vibration system |
JPS5978795U (en) * | 1982-11-18 | 1984-05-28 | 松下電器産業株式会社 | rectangular cone speaker |
JPS60219896A (en) * | 1984-04-17 | 1985-11-02 | Matsushita Electric Ind Co Ltd | Flat speaker |
JPS6140097U (en) * | 1984-08-17 | 1986-03-13 | 株式会社東芝 | Square cone speaker device |
JPS63117599A (en) * | 1986-11-05 | 1988-05-21 | Matsushita Electric Ind Co Ltd | Dynamic speaker |
JPS6482896A (en) * | 1987-09-25 | 1989-03-28 | Matsushita Electric Ind Co Ltd | Diaphragm for loudspeaker |
JPH0186798U (en) * | 1987-11-30 | 1989-06-08 | ||
JPH0434478Y2 (en) * | 1987-12-17 | 1992-08-17 | ||
JPH01159500U (en) * | 1988-04-21 | 1989-11-06 | ||
US4881617A (en) * | 1988-12-30 | 1989-11-21 | Alexander Faraone | Radially arcuated speaker cone |
US5256837A (en) * | 1991-10-30 | 1993-10-26 | Pak Il Y | Paper cone for cone type speaker |
JP4876293B2 (en) * | 2000-01-27 | 2012-02-15 | ノウルズ、エレクトロニクス、アジア、プライベート、リミテッド | Electroacoustic transducer having a diaphragm with a coil mounting protrusion and a stabilizing wall disposed therebetween |
JP4407229B2 (en) * | 2003-10-15 | 2010-02-03 | パナソニック株式会社 | Speaker diaphragm and speaker using the same |
-
2004
- 2004-07-30 KR KR1020067002710A patent/KR20060058711A/en not_active Application Discontinuation
- 2004-07-30 AT AT04744689T patent/ATE536708T1/en active
- 2004-07-30 EP EP04744689A patent/EP1654907B1/en active Active
- 2004-07-30 CN CNA2004800226587A patent/CN1833465A/en active Pending
- 2004-07-30 WO PCT/IB2004/051336 patent/WO2005015949A1/en active Application Filing
- 2004-07-30 JP JP2006522469A patent/JP2007502040A/en active Pending
- 2004-07-30 US US10/567,215 patent/US20080232633A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
ATE536708T1 (en) | 2011-12-15 |
US20080232633A1 (en) | 2008-09-25 |
EP1654907A1 (en) | 2006-05-10 |
WO2005015949A1 (en) | 2005-02-17 |
CN1833465A (en) | 2006-09-13 |
JP2007502040A (en) | 2007-02-01 |
KR20060058711A (en) | 2006-05-30 |
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